Abstract
We report experimental results on In-doped Sn0.8Pb0.2Te solid solutions which are semiconductors with superconducting properties. We carried out simultaneous magnetic susceptibility and resistivity (four-point) measurements down to 1.5 K, as well as specific heat below 4.2 K, on poly-crystalline samples. All measurements indicate same critical temperature region, above which the specific heat exhibits a T3 behavior, with θD∼85 K consistent with that of the constituent elements. Application of a magnetic field (∼1 kG) suppresses the specific heat anomaly from the temperature range down to 2 K. The results suggest that this compound undergoes a bulk superconducting transition.
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